Deck 20: Introduction to Metabolic Pathways

Question 1

Which type of regulation is most likely for the regulated enzymes of energy-generating oxidative pathways?

A)Stimulation by adenosine triphosphate (ATP).
B)Stimulation by adenosine diphosphate (ADP).
C)Stimulation by the reduced form of nicotinamide adenine dinucleotide (NADH).
D)Feedback inhibition by carbon dioxide.
E)Inhibition by the substrate of the pathway.

Answer 1

Stimulation by adenosine diphosphate (ADP).

Question 2

Which is the most likely regulated step in metabolic pathways?

A)The first reaction in the pathway, regardless of whether it is reversible or irreversible.
B)The first irreversible reaction of the pathway.
C)The first endergonic reaction in the pathway.
D)The last reaction of the pathway.
E)The reaction whose enzyme is present in the highest activity in the cell.

Answer 2

The first irreversible reaction of the pathway.